THE BUILDING CODE

PROCESSING EQUIPMENT AND PROCESS PIPELINES

SNIP 3.05.05-84*

THE USSR STATE COMMITTEE FOR CONSTRUCTION

Moscow 1984

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SNIP 3.05.05-84 1/23
DEVELOPED: by VNIImontazhspetsctroi (The All-Union Installation and Special Construction
Research Institute) of the Minmontazhspetsstroi of the USSR (The Ministry for Installation and Special
Construction of the USSR). Subject Manager - V.Ya. Popovskiy, Doctor of Engineering; Executives-in-
Charge - V.I. Obeturov, PhD in Engineering; Yu.V. Popov, PhD in Engineering; R.I. Tavastshern, PhD
in Engineering; and
by Gyproneftespetsvontazh (The Petroleum Industry Special Construction Department) of the
Minmontazhspetsstroi of the USSR. I.S. Goldenberg, PhD in Engineering, and by Gyprokhimmontazh
(The Chemical Industry Special Construction Department) of Minmontazhspetsstroi of the USSR.
LP. Petrukin; M.L. Eliyash.

INTRODUCED: by Minmontazhspetsstroi of the USSR

PREPARED AND APPROVED by the Technical Normalization and Standardization Department of

GOSSTROI of the USSR (The USSR State Committee for Construction). Executive-in-Charge - B.A.
Sokolov.

By GIVEN EFFECT to this SNIP 3.05.05-84 "Processing Equipment and Process Pipelines" the SNIP
Ш-31-78 "Processing Equipment. General Provisions" becomes invalid.

The USSR State Committee for The Building Code SNIP 3.05.05-84
Construction (GOSSTROI of the Processing Equipment and Instead of SNIP Ш-31-78
USSR) Process Pipelines

This SNIP shall apply to manufacturing and acceptance of processing equipment installation and
process pipelines (hereinafter referred to as "equipment" and "pipelines") designed for receiving,
processing and transporting initial, intermediate and final products at absolute pressure from 0.001
MPa (0.01 kgf/cm2) up to 100 MPa (1000 kgf/cm2), and delivery pipelines for heat-transfer media,
lubricants and other substances required for equipment operation.
This SNIP is of binding force for all organizations and enterprises involving in engineering and
construction of new enterprises, and modernization, reconstruction and revamp of the existing ones.
Equipment and pipeline installation works to be supervised by the Gosgortechnadzor of the USSR
(The USSR State Committee for Industry and Mine Supervision) including welding and supervision the
quality of welding connections shall be conducted in accordance with the Regulations and Standards
of the Gosgortechnadzor of the USSR.

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SNIP 3.05.05-84 2/23
1. GENERAL PROVISIONS

1.1. The requirements of SNIP 3.01.01 -84, SNIP Ш-4-80, standards, technical specifications and
departmental normative documents approved in accordance with SNIP 1.01.01-82 must be observed
during equipment and pipeline installation works.
1.2. Equipment and pipeline installation works must be conducted in accordance with the design
estimates and operating documentation, work conducting project and vendors' documentation.

Introduced by Approved by Resolution of the The Effective Date:

Minmontazhspetsstroi State Committee for January 1, 1985.
of the USSR Construction, # 72
dated of May 7, 1984.

1.3. Installation of equipment and pipelines must be conducted on the base of Section Construction
Method and Factory-Assembled Module Installation Method.

Notes:
1. The Section Construction Method means arrangement of construction works with corresponding split of facility to
be commissioned into interconnected process sections - constructive and process separated parts of the construction
facility. Their technical readiness after completion construction-and-assembling operations shall allow conducting
commissioning works, individual tests and comprehensive run-up of aggregates, machinery and devices independent
upon the readiness of facility in whole.
2. The Factory-Assembled Module Installation Method means arrangement of the equipment and pipeline installation
with corresponding maximal work transfer from the construction site to the industrial production conditions by
assembling equipment, pipelines and structures in units at vendors' sites, as well as at assembly and gather
enterprises of the building industry and construction-and-installation organizations with subsequent delivery to the
construction sites as set of module units.

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SNIP 3.05.05-84 3/23
1.4. The documentation to be issued by installation organization according to item 1.2 must provide
the following:

a) employment of process units and communication units with aggregation of their parts on base of
nomenclature and technical specifications approved or mutually agreed by higher organizations of the
customer and subcontractor conducting installation works;
б) split of construction facility into process sections the composition and limits of which must be
established by engineering organization upon adjustment with the customer and subcontractor
conducting installation works;
в) possibility to deliver process units and communication units to their installation site in assembling
form. If necessary, the openings in walls and floors of premises shall be made together with installing
hinging devices in supporting building structure to conduct installation operations using the turn
method, as well as with reinforcing, if necessary, the building structures for additional temporary loads
to be imposed during installation; permanent or provisional roads for heavy-weighted and large-sized
equipment transportation, and high capacity cranes as well, r) data on allowances for calculation of
precision of geodesic layout works and creation internal geodesic layout base for equipment
installation.
1.5. General contractor must involve an installation organization in consideration and drawing up the
report on construction arrangement project, structural concepts of buildings and installations, as well
as on process layout in which the possibility and main conditions for conducting works by the Section
Construction and Factory-Assembled Module Installation Methods have to be established.
1.6. General contractor must provide and installation organization must receive from the general
contractor (or directly from the customer upon agreeing with the general contractor) the required
package of working documentation with the customer's note on their acceptance for work at each
drawing (counterpart).

1.7. Delivery of equipment, pipelines and required accessories and materials should be conducted
according to the schedule agreed with the installation organization. This schedule must provide the
first delivery priority to machines, apparatus, reinforcement steel, structures, articles and materials
included into the specifications of units to be subjected to manufacturing by installation organizations.
1.8. Completion of equipment and pipeline installation operations shall be deemed the completion of
individual tests performed in accordance with Section 5 of this SNIP, and signing by the working
commission the equipment acceptance act.
Upon completion the installation by installation organization, i.e. completion the individual tests and
equipment acceptance for comprehensive run-up, the customer should conduct the equipment
comprehensive run-up in accordance with the obligatory Attachment 1.
1.9. Common and special registers of work conducting according to SNIP 3.01.01-84 should be kept
at each construction facility. Besides, working documentation, which type and content must be in
compliance with the obligatory Attachment 2, shall be drawn up. The form of his documentation shall
be established by the departmental normative documents.

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SNIP 3.05.05-84 4/23
2. INSTALLATION WORKS PREPARATION

General Requirements

2.1. The preparation according to SNIP 3.01.01-84 and this SNIP must be conducted prior to
equipment and pipeline installation.
2.2. The customer must establish in organizational and technical preparation and agree with general
contractor and installation organization the following issues:

а) conditions of facility equipment and material delivery of the customer's scope of supply stipulating
the delivery of sets of equipment for process line, process unit, process section;
б) schedules establishing terms of equipment, items and material delivery with taking into
consideration the installation sequence, and schedules of conducting associated special construction
and start-up works;
в) degree of the prefabricated equipment readiness with consideration the requirements of GOST
24444-80 and technical specifications defining installation and process requirements to the delivery of
equipment to be installed;
r) the list of equipment to be installed with involving the vendor's personnel;
д) conditions of transportation to the installation places of the heavy-weighted and large-sized
equipment.

2.3. The following items have to be executed during the preparation of installation organization for
work:

а) to prepare the Plan of Industrial Works (PPR) for equipment and pipeline installation;
б) to complete construction works on preparing site for enlarged assembling of equipment, pipelines
and structures, units (process and communication ones);
в) to complete preparation of hoisting and transportation devices, devices for installation and
individual testing the equipment and pipelines, inventory production and sanitary and utility buildings
and facilities planned by PPR; to prepare the production base for units (process and communication
ones) assembling, pipeline and metal structures manufacturing;
r) to undertake measures stipulated by the labor safety, fire precaution and environment protection
regulation and standards.

2.4. The preparation of installation works must be conducted in accordance with the schedule and
shall include:
transfer by the customer the equipment, items and materials; acceptance by the installation
organization the production buildings, facilities and footing for installation equipment and pipelines
from the customer; manufacturing pipelines and structures; assembling of process units,
communication units and enlarged assembling of equipment; delivery of equipment, pipelines and
structures to the working area.

Acceptance of Equipment, Items and Material for Installation

2.5. Prior to transfer equipment, items and materials the customer (general contractor) must submit to
installation organization the following:

а) accompanied documentation for equipment and valves in accordance with GOST 24444-80;
б) assembling drawings of pipelines, supports and suspensions, and documents certifying their
qualities for assembling units of pipelines with nominal pressure from 10 to 100 MPa (100-1000
kgf/cm2);
в) vendors' material certificates;

If the vendors' documents are not available they may be replaced with the documents with
corresponding content signed by authorized representatives of vendors.
Conformance of brands, models, dimensions and other characteristics of equipment, items and
materials, working documentation for installation woks must be checked using the accompanied
documentation.
2.6. Equipment, items and materials must be transferred for installation in sets for section and process
unit in accordance with the working drawings.
The procedure of equipment, items and materials transfer has been established by "Provision on
Interrelations of Organizations - General Contractors with Subcontracting Organizations".

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SNIP 3.05.05-84 5/23
2.7. When transferring equipment for installation, it is subject for examination, checking completeness
(without disassembling in assembling units and parts) and conformance of accompanied
documentation to the requirements of working drawings, standards, technical specifications and other
documents establishing installation and process requirements, checking availability and validity term of
vendor's guarantee.
The customer must perform elimination of equipment defects identified in the process of acceptance.
2.8. Equipment and items with expired guarantee period indicated in technical specification, and
under the absence of above identification - on the expiry of the year, may be accepted for installation
only after conducting a supervision examination, elimination of defects, testing and other works
stipulated in the operational documentation. The results of the conducted works must be recorded in
logbooks, certificates and other accompanied documentation in accordance with item 2.5 of this SNIP.
2.9. Equipment, items and materials accepted for installation must be in storage in accordance with
the requirements of vendors1 documentation and PPR.
During storage the examination access must be provided to them, and created conditions preventing
mechanical damage, moisture and dust penetration to internal parts.

Installation Acceptance of Buildings, Facilities and Basements

2.10. In buildings and facilities under accepting for installation of equipment and pipelines the
construction works planned in PPR including those indicated in item 2.3 of this SNIP to have been
fulfilled, underground communication to have been laid, back filling and soil consolidation to design
level to have been done, strainers for floor coatings and channels to have been made, crane runaways
and monorails to have been prepared and accepted, holes for pipeline laying to have been made and
fixing details for pipeline supports to have been installed. Basement and other structures must be
cleaned from shuttering and debris. Openings must be guarded and manholes and trays locked.
In equipment and pipelines installation buildings with special requirements on cleanness, temperature
level and etc. specified in technical specifications, the conformity to this requirements must be
observed during acceptance of such buildings for conducting installation works.
2.11. Axes and elevation marks determining the design position of the being installed items must be
made with the required accuracy in buildings, facilities and other structures accepted for conducting
installation works. This procedure is established in SNIP for geodesic works in construction.
Axes and elevation marks shall be made in the fixing metal plates of basements for equipment
installation which precision is subject of high requirements, as well as for equipment with considerable
length values.
Basement elevation marks for equipment installation required grout must be 50 - 60 mm lower than
the mark of supporting surface of equipment given in drawings, and in places of equipment extended
edges - 50 - 60 mm lower than the mark of these edges.
2.12. Foundation bolts holes and wells must be drilled in installation basement, foundation bolts and
fixing details must be installed in installation basements, if it is provided in the working drawings of the
basement.
If jig plates for foundation bolts in the basement mass are given in drawings, such jig plate installation
and installation of foundation bolts fastened to them shall be conducted by equipment installing
organization. Drilling holes in basements, installing foundation bolts fastened with adhesive and
cement mixes shall be conducted by construction organization. Foundation bolts grouted in the
basement must be corrosion protected in the part extended from the basement.
2.13. During installation acceptance of buildings, facilities and building structures the executive
location diagram of foundation bolts, fixing details and other fastening details of equipment and
pipelines shall be simultaneously submitted.
Deviation actual sizes from those given in working drawings must not exceed the values established
by the corresponding SNIPs.
2.14. Buildings, facilities and basements required for installation equipment set and pipelines and
which form a process unit must be subjected to simultaneous acceptance.

Manufacturing of Pipeline Assembling Units

2.15. Manufacturing of assembling units of pipelines shall be conducted in accordance with the
detailed drawings, GOST 16037-80 and the requirements of departmental normative documentation.
Permanent connections must be made in accordance with the requirements of section 4 of this SNIP.
2.16. Pipeline assembling units under installation accepting must be equipped according to detailed
drawings specifications; welded joints must be welded and checked, surfaces must be flattened; holes
must be closed with clogs.

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SNIP 3.05.05-84 6/23
Deviation of linear dimensions of pipeline assembling units must not exceed ± 3 mm per each meter
but not more than ± 10 mm per entire length. Deviation of angular dimensions and axis misalignment
must not exceed ± 2.5 mm per 1 m but not more than ± 3 mm per entire sequent tangent.

Process and Communication Units Assembling

2.17. Assembling and welding of process and communication units pipelines should be conducted in
accordance with the requirements of section 2 and 4 of this SNIP.
Installation of instruments, instrumentation, electrical devices and automation systems in process and
communication unit must be conducted in accordance with the requirements of SNIP for electrical
device installation and automation system installation.
2.18. After assembling the process units must be tested, painted and holes must be clogged. Testing
of units or their assembling parts shall be conducted in compliance with the requirements of section 5
of this SNIP.
Assembling parts of communication units not connected with equipment shall be tested during
individual test after their installation in design position.
2.19. The requirements of item 2.9 of this SNIP should be followed for storage the assembled units.
2.20. Pipelines in communication units must be laid and fastened on permanent supports.

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SNIP 3.05.05-84 7/23
3. INSTALLATION OPERATIONS

General Requirements

3.1. When loading, unloading, transporting, lifting, installing and positioning equipment and pipelines
their undamaged state must be provided. Transportation in-site, installation and positioning shall be
conducted in accordance with PPR.
3.2. Equipment, pipelines, process units and communication units must be properly hoist sling applied
to specially provided part or in places indicated by vendor. Releasing equipment and pipelines from
hoist sling should be carried out after their proper fastening or installation in stable position.
3.3. Loads to building structures appeared due to placing, moving and installing equipment and
pipelines, hanging and installing lifting devices must not exceed the permitted installation loads (in
value and application place) given in the working drawings. The possibility to increase loads has to be
approved by engineering organization and organization performing general construction works.
3.4. During installation the equipment and pipeline accessories are not subjected to disassembling
and examination, except cases when it is stipulated in the state and departmental standards and
technical specifications approved in the established procedure. Disassembling of equipment sealing
supplied from vendor shall be prohibited, except cases described in item 2.8.
3.5. Prior to installation in design position the external surfaces of equipment and pipelines must be
cleaned from preservation grease and coating, except surfaces that must remain coated with
protective compositions during the process of installation and equipment operation.
The protective coating of equipment shall be removed, as a rule, prior to individual test without
equipment disassembling in accordance with guidelines given in vendor's documentation.
3.6. Polluted, deformed, protective coating and treated surfaces damaged equipment and pipelines,
as well as equipment and pipelines with other defects are not subjected to installation until damage
and defect elimination.
3.7. During installing of equipment and pipelines the on-line monitoring of quality of performed works
must be carried out. Identified defects are subject to eliminating before the beginning of the next
operations.
3.8. Installation works at ambient air temperature lower or higher than stipulated by operational
conditions of equipment and pipelines must be carried out with observing measures providing their
undamaged state.

Equipment Installation

3.9. Equipment installation must be carried out on basement cleaned from oil spots and dirt.
3.10. Positioning of equipment must be conducted in accordance with guidelines of vendor's
documentation and working drawings in regard to the axes or signs, specially indicated with marks and
reference points (with required precision), or in relation to the earlier installed equipment with which
the positioning equipment is kinematic or process connected.
3.11. Installation of equipment on provisional supporting elements must provide absence of
deformations and reliability of fastening before grouting.
3.12. The seat surface of equipment must be tightly attached to the supporting elements; and
adjusting screws - to supporting plates; permanent supporting elements (concrete pads, metal
backings and etc) - to the basement surface.
3.13. If provisional supporting elements are used for positioning of equipment under installation, the
preliminary nuts tightening should be done during grouting to avoid equipment displacement. The final
tightening shall be conducted in accordance with the technical documentation of vendor upon reaching
by grouting material the strength not less than 70% of the designed value. After positioning and
fastening of equipment on basement the installation inspection act shall be drawn up.
3.14. Grouting of equipment must be performed by a construction organization not later than 48 hours
after the written notification from installation organization and in the presence of its representative.
3.15. Grout concrete curing and its handling must be executed in accordance with the requirements of
SNIP for concrete works conducting and PPR.

Pipeline Laying

3.16. Pipelines shall be connected only to the support fixed equipment. The connection of pipelines to
equipment should be done without tightening. Fixed supports shall be fastened to support structures
after connecting pipelines with equipment.
Prior to installing pipeline assembling units in the design position nuts of flange connection bolts must
be tightened and welded joints must be welded.

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SNIP 3.05.05-84 8/23
3.17. The deviation of pipeline supports and support structures positions during their installation from
the design one must not exceed ± 5 mm for pipelines laid inside premise and ± 10 mm for outside
pipelines; slope - not more than + 0.001, unless other allowances have been specially established in
the project.
To provide the design pipeline slope it is allowed to install metal backings under supports. These
backings shall be welded to embedded items or steel structures.
Support and suspender springs must be tightened in accordance with guidelines given in the working
drawings.
3.18. When steel pipelines are laid in racks, channels or trays their final tightening shall be done in
each "temperature" unit beginning from the fixed supports.
3.19. Pipeline sections enclosed in sleeves must be without joints when laying through the walls or
floors. Prior to sleeving the pipelines should be insulated and painted. Clearances between pipelines
and sleeves must be sealed with noncombustible material.
3.18. When laying glass, rubberized and plastic lined pipes no bending by heating, cutting-in nozzles
and "lugs" to the assembled pipelines is allowed. Length deviations from the design pipeline length
must be compensated by insertions (rings) to be installed in flange connections.
3.19. Welding works and heat-insulating works in laying area must be completed by the beginning of
laying plastic and glass pipelines.
3.20. Glass pipelines should be laid upon equipment installation completing and metal and plastic
pipelines laying. The flexible gasket should be placed between cramp and glass pipe if glass pipes are
fastened with metal cramps.
3.21. If necessary, the glass pipelines should be emptied from transporting media by gravity, inert gas
or air purging under pressure not more than 0.1 MPa (1 kgf/cm2). It is not allowed to use steam for
pipeline purging.
3.22. When laying glass pipelines, flange and split coupling connections with flexible sealing gaskets
chemically stable to media used for pipeline flushing should be used.

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SNIP 3.05.05-84 9/23
4. WELDED CONNECTIONS AND OTHER PERMANENT CONNECTIONS OF PIPELINES.

General Requirements

4.1. Welders certified in accordance with Regulation on Welders Certification approved by

Gosgortechnadzor of the USSR are allowed for welding joints of steel pipelines with nominal pressure
10-100 MPa (100-1000 kgf/cm2) of I, II, III and IV categories (according to SN (construction standard)
527-80). Welders who did not pass the above certification but had welded test joints may conduct
welding joints of steel pipelines of the V category.
4.2. Welders (for all welding types) who conduct pipeline welding during its laying for the first time or
who had work interruption over 2 months, as well as all welders, independent upon their certification,
in case of using new welding materials or equipment must weld test joints under conditions similar to
pipeline welding conditions at the given facility.
4.3. The tests joints of steel pipelines must be examined, mechanically tested according to GOST
6996-66 in compliance with the obligatory Attachment 3, and also checked for continuousness using
nondestructive inspection technique in accordance with the requirements of items 4.8 "в", 4.10-4.14.
In case of poor quality of test joint welding identified by:

а) external examination - the joint shall be rejected as defected and is not subject to other inspection
techniques;
б) checking for continuousness using nondestructive inspection technique - the welder who welded
the defected joint shall conduct welding of two more test joints and if even one of these joints is
rejected as defected the welding of test joints must be rejected;
в) mechanical testing - the additional test of double quantity of joints from the same connection or
from the one additionally welded by this welder, and if even one of these joints is rejected as defected
the welding of test joints must be rejected;

In the above cases the welder who welded rejected test joints may be allowed to welding test joints of
pipelines only upon passing exams according to programs approved by Ministry (Agency) of the
USSR.
4.4. Welding permanent connections from non-ferrous metals and alloys, welding and assembling
plastic pipelines must be conducted only by workers who passed examinations according to programs
approved by Ministry (Agency) of the USSR.
4.5. Welding of steel pipelines is allowed to conduct at temperatures specified in Regulation approved
by Gosgortechnadzor of the USSR, departmental normative documentation and industry branch
standards.
Welding of non-ferrous metal pipelines, as well as welding and assembling plastic pipelines is
permitted to conduct at ambient air temperature not lower than 5°C.
4.6. Pipe edges and pipeline parts surfaces to be connected must be treated and cleaned before
welding according to the requirements of departmental normative documentation and industry branch
standards.
4.7. Welded connections of pipes and parts must be completely cooled before laying, and cooling of
plastic pipelines with adhesive connections must be not less than 2 hours.

Steel Pipeline Connection Quality Control

4.8. Quality control of steel pipelines welded connections must be carried out by systematic online
inspection, mechanical testing of samples cut-off from test joints; checking continuousness of joints for
internal defects using one of the nondestructive inspection techniques, and also subsequent hydraulic
or pneumatic testing in accordance with section 5. Quality control methods have been established by
GOST 3242-79.
Quality control of welded joints of V category pipeline is conducted only by on-line examination. In
cases stipulated in project a intercrystalline corrosion resistance testing of welded connections from
stainless steels should be conducted in accordance with GOST 6032-75 and departmental normative
documents.
4.9. On-line quality control of welded connections of steel pipelines shall plan checking state of
welding materials, quality of treated pipe edges and pipeline parts, accuracy of assembling works,
observing set welding conditions, observing geometrical dimensions of joints, and checking welded
connections for on-surface defects.
4.10. Radiographic or ultrasonic control of welded connections of steel pipelines should be carried out
after elimination defects identified during external examination and by measuring, and for pipelines
with nominal pressure 10-100 MPa (100-1000 kgf/cm 2) - after checking by magnetic powder or color
inspection technique.

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SNIP 3.05.05-84 10/23
Welded joints must be without cracks, burns-through, cavities, ripples, undercuts with depth more than
0.5 mm.
No undercut is allowed in welded joints of pipelines with nominal pressure 10-100 MPa (1001000
kgf/cm2).
4.11. Percentage of control of welded joints of steel pipelines by nondestructive inspection techniques
to total number of joints welded by each welders (but not less than one joint) must be as follows:

Pn 10-100 MPa (100-1000 kgf/cm2) 100

I category 20
II category 10
III category 2
IV category 1

Ultrasonic, radioxerographic techniques and radiographic technique with using photographic paper as
detector should be preferably used as nondestructive inspection technique. The entire perimeter of
joint must be checked.
For checking root of welded connection joints of pipeline with Pn 10-100 MPa (100-1000 kgf/cm 2) from
all steels with wall thickness 16 mm and more should be carried out by radiographic technique, and
final inspection of finished welded connections from steels С, ХГ, XM - predominantly by ultrasonic
defectoscopy.
Finished welded connections of pipelines Pn 10-100 MPa (100-1000 kgf/cm2) should be magnetic
powder or color inspected before radiographic or ultrasonic test. At that, joint surface and adjacent
area with 20 mm width from joint edges are subject to examination.
4.12. Valuation of quality of steel pipeline welded connections after radiographic control should be
made using numerical score according to obligatory Attachment 4. Welded connections must be
rejected if their total score is equal or more:

Pipelines:
Pn 10-100 MPa (100-1000 kgf/cm2) 2
I category 3
II category 3
III category 5
IV category 6

Welded connections with above values or higher ones are subject to reworking, then the additional
inspection of double, in refer to initial number) quantity of joints welded by the same welder shall be
conducted. Welded connections of pipelines of the III and IV category evaluated correspondingly by 4
and 5 are not subjected to reworking, but double quantity of joints welded by this welder must be
additionally checked.
If even one joint under additional checking is rejected (and for pipelines of the III and IV category is
valued correspondingly by 4 and 5) 100% of joints welded by this welder must be tested. If even one
joint under this testing is rejected the welder must be suspended from pipeline welding works.
4.13. Sensitivity of radiographic control must correspond to (according to GOST 7512-82): For
pipelines with Pn 10-100 MPa (100-1000 kgf/cm2) and of the I and II category - 2 class; III and IV
category - 3 class.
4.14. According to the results of ultrasonic inspection the welded connections of pipelines with Pn 10-
100 MPa (100-1000 kgf/cm2) are deemed to be of good quality, if there are no:

а) extensive junction and volume defects;

б) volume non-extensive defects with reflection amplitude corresponding to the equivalent area 2 mm 2
and more at pipe wall thickness up to 20 mm inclusively, and 3 mm 2 and more at pipe wall thickness
more than 20 mm.
в) volume non-extensive defects with reflection amplitude corresponding to the equivalent area 2
mm2 and more at pipe wall thickness up to 20 mm inclusively, up to 3 mm 2 and more at pipe wall
thickness more than 20 mm, in number more than 3 for each 100 mm of the joint.

Welded connections of steel pipelines of the I-IV categories must meet the requirements established
by the industry branch standards.
If the ultrasonic inspection results are not satisfactory even for one joint then the inspection of double
quantity of joints welded by the same welder shall be conducted. If the additional control results turn
out to be unsatisfactory the 100% inspection of joints welded by this welder must be carried out. This

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SNIP 3.05.05-84 11/23
welder may be allowed to pipeline welding only upon passing examination according to programs
approved by Ministry (Agency) of the USSR.
4.15. Parts of welded joint of steel pipelines are subject to reworking by local taking up and sequent
welding (without rewelding the entire welded connection) if taking up sizes after removal of defected
part does not exceed values given in Table 1.
Welded joint to be correlated using taking up with size exceeding the allowable values in Table 1 must
be completely removed and new "spool" must be welded in this place. The defective parts of welded
connection identified using external examination and by measuring, ultrasonic, magnetic powder or
color inspection technique must be reworked.

Allowable Sizes of Taking Up After Removal defective Parts of Welded Joint

Taking Up Depth in % of Nominal Thickness of Total length in % from Nominal Outside Perimeter
Pipe Walls or Design Section of Welded Joint of Welded Connection
For pipelines with Pn 10-100 MPa (100-1000 kgf/cm2)
Up to 15 not regulated
Over 15 up to 30 up to 30
Over 30 up to 50 up to 20
Over 50 up to 15
For pipelines of I-IV categories
Up to 25 not regulated
Over 25 up to 50 up to 50
Over 50 up to 25

In joints rejected due to radiographic test results the reworking should be applied to joint parts with the
highest value determined in accordance with item 4.12 and obligatory Attachment 4. In case if the
welded joint has been rejected due to sum of the like scores, the faulty fusion parts of welded joint
must be correlated.
One the same place of joint is allowed to correlate only one time. Elimination of defects using caulking
is prohibited.
All correlated parts of welded joints must be inspected by nondestructive techniques. Reworking data
and data on additional welded joints testing must be recorded in operational documentation according
to the obligatory Attachment 2.
4.16. Welded joint metal strength test must be conducted for welded connections of pipelines with Pn
10-100 MPa (100-1000 kgf/cm2), and for pipelines with nominal pressure up to 10 MPa (100 kgf/cm 2)
from steel XM and ХФ.
According to the strength test results the welded joints shall be deemed to be of good quality if the
following conditions are fulfilled:

а) reduction of weld metal strength shall be not than 25 HB lower the low strength value of the main
metal;
б) exceeding of weld metal strength shall be not than 20 HB higher the upper strength value of the
main metal;
в) exceeding of difference between the main metal strength and metal strength in thermal impact is
not more than 50 HB.

If there is a strength difference exceeding the allowable one, the welded joints must be thermal
treated, and, if the strength difference exceeds the allowable one after the additional thermal
treatment, the styloscopy of welded joint metal and main metal of all same type joints, welded by the
given welder during the period of time after the last control inspection, must be conducted. The welded
joints must be rejected if the chemical composition of weld metal does not correspond to prescribed
one.

Non-Ferrous Metal and Alloy Pipeline Connection Quality Control

4.17. Quality control of welded and brazed connections should be carried out by external examination
and hydraulic or pneumatic testing of pipeline in accordance with guidelines given in section 5.
4.18. The brazed connections must have flat surface with smooth transition to the main metal. Dull
ends, pinholes, shells, impurities and faulty fusion are not allowed.
4.19. Defective places of brazed connections may be correlated by brazing with sequent
repeated testing, but not more than two times.

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 12/23
Plastic Pipeline Connection Quality Control

4.20. Quality control of plastic pipeline connections shall include initial check, on-line control and
acceptance inspection (external examination and measurements, rapid quality control of welded
connections and their mechanical testing).
4.21. During initial checking of welded and assembling (adhesive) connections the material and item
quality for conformity with the requirements of standards and departmental normative documentation
should be checked.
4.22. On-line control of welded connections must provide checking of pipe assembling quality for
welding, quality of pipe edges surfaces, cleanness of working surfaces of heating devices and control
of welding conditions. On-line control of assembling connections must provide checking the quality of
surfaces for gluing, observation the clearance values during pipe assembling and process conditions
of gluing.
4.23. All welded and adhesive connections are subject to external examination and measuring. Their
appearance must meet the following requirements:

а) bead of welded connection formed in the result of hot-tool butt welding must be symmetric and
evenly distributed in width and perimeter;
б) bead of welded connection must not have sharp delimiting line, its surface must be flat without
cracks, gas holes and foreign impurities; if faucet welded the bead must be evenly distributed in hub
edge;
в) at gas bar sealing of polyvinyl chloride pipes there must be no hollows between bars, no
overburning of material of items and welding bars, no uneven reinforcing of welded connection in width
and height; the surface of welded connection must be convex and smoothly adjoined to the main
material;
r) at gluing pipes the clearance between pipes must be filled with adhesive skin evenly extended in
perimeter of the connection.
4.24. When hot-tool butt welding in case of identification defects in connection the corresponding
sections of pipes shall be cut-off and "spool" with length not less than 200 mm shall be welded. When
bar sealed the defected sections may be correlated without cutting-off.
4.25. Rapid quality control of welded connections should be carried out during receiving the new pipes
by tensile, bending and tear-off testing of samples, in accordance with the requirements of
departmental normative documentation, for adjustment welding equipment and changing welding
conditions.
4.26. Mechanical elongation and shear tests shall be conducted for welded connections of pipelines of
the II and III categories.
0.5% of the total quantity of connections made in one facility, including not less than one percent of the
total number of connections made by one welder, is subject to inspection. Selected for testing samples
must be rectilinear ones. Welded connection must locate in the center of the having cut-off section.
Sizes and quality indicators of the testing samples shall be taken in accordance with the requirements
of departmental normative documents.
The time period between welding and sample elongation and shear testing must be not less than 24
hours.
If the results of elongation or shear test are not satisfactory even in one connection the additional test
for double quantity of them should be conducted. If the results of the additional testing are not
satisfactory then all welded connections should be rejected and cut-off.

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 13/23
5. INDIVIDUAL TESTING OF INSTALLED EQUIPMENT AND PIPELINES.

5.1. The installation of lubricating systems, systems of cooling, fire protection, electrical equipment,
protective grounding, automation required for conducting individual tests must be completed by the
beginning of the individual testing. By this time start-up works providing reliable operation of the above
systems directly connected with conducting individual testing the given process equipment must be
also completed.
Procedure and terms of conducting individual testing and start-up works must be established by
schedules approved by installation organization and start-up organizations, general contractor,
customer and other organizations involved in execution of construction-and-installation operations.
5.2. Vessels and process vessels assembled in construction site must be strength and leakage
tested.
Completely assembled and tested by vendor vessels and process vessels delivered to the
construction site are not subjected to the individual strength and leakage testing. Type of testing
(strength, leakage), testing technique (hydraulic, pneumatic and etc.), value of testing pressure,
duration and results of testing must be indicated in the accompanied or in working documentation.
5.3. Machines, machinery and apparatus should be tested at idle running with checking observation
the requirements stipulated by technical specifications of vendor.
Machines, machinery and apparatus assembled in the process of installation, as well as those
delivered assembled and sealed for installation, are not subject to disassembling before testing.
5.4. Pipelines must be strength and leakage tested.
Type of testing (strength, leakage), testing technique (hydraulic, pneumatic and etc.), evaluation of
testing results must be taken in accordance with the working documentation. Strength testing pressure
value (hydraulic and pneumatic) should be taken according to Table 2, unless otherwise specified.

Table 2
Pressure MPa (kgf/cm2)
Pipeline Material Testing Pressure
Operating Pressure
not lower not higher
Steel; plastic, enamel up to 0.5(5) 0.2(2) 1.5 Op
lined steel 0.5(5) and higher 0.8(8) 1.25 Op
Plastics, glass this SNIP application 0.2(2) 1.25 Op
Non-ferrous metals and range 0.1(1) 1.25 Op
alloys

The testing pressure for steel pipelines with wall temperature higher 400°C should be taken 1.5 Op,
but not less than 0.2 MPa (2 kgf7cm2).
Leakage testing pressure value must correspond to the operating pressure.
5.5. Split (if necessary) of pipeline into sections during testing, combining strength and leakage tests
and method of defect identification (soap solution, application of leak detectors and etc.) shall be made
by testing organization, unless otherwise specified in working documentation. At than, the safety
requirements, fire protection requirements and regulations of Gosgortechnadzor of the USSR have to
be observed.
5.6. During hydraulic testing it is allowed to tap steel pipelines with hammer (weight not more than 1.5
kg), and for non-ferrous metal pipelines - not more than 0.8 kg.
No tapping is permitted during pneumatic testing.
5.7. Strength and leakage tests of plastic pipelines should be conducted not earlier than 24 hours
after welding or assembling connections.
5.8. Testing of equipment and pipelines under control of the state supervision authorities should be
conducted in accordance with the requirements of regulations approved by these authorities. In case
of identification during equipment and pipeline testing the defects made during installation operations
the testing must be repeated after these defects eliminating.
It is not allowed to eliminate defects in vessels, process vessels and pipelines under pressure, and in
machines and machinery during their operation.
5.9. In the process of hydraulic testing of equipment and pipelines at negative temperatures the
measures should be undertaken to prevent fluid freezing (heating, introducing freezing temperature
additives).
5.10. After completion hydraulic testing the fluid must be removed from pipelines, vessels and
process vessels, and shutdown valves must be in open state.

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 14/23
5.11. During pneumatic testing the pressure in vessel, process vessel, pipeline should be gradually
increased with examination at the following phases: upon reaching 60% of testing pressure value for
vessels, process vessels and pipelines with operating pressure up to 0.2 MPa (2 kgf/cm 2) and upon
reaching 30% and 60% of testing pressure values for vessels, process vessels with operating
pressure 0.2 MPa (2 kgf/cm2) and higher. During examination the pressure increase must be stopped.
The final examination shall be conducted under operating pressure and, as a rule, combined with
leakage testing.
5.12. The instruction on safe test conducting in specific conditions should be developed prior to the
beginning of testing. All testing personnel must get know of them.
5.13. Pneumatic strength test is not allowed for:
а) vessels, process vessels and pipelines manufactured from bristle materials (glass, cast iron, faolite
and etc.);
б) vessels, process vessels and pipelines located in existing shops;
в) pipelines located in racks in channels and trays near the existing pipelines; and
r) under surplus pressure higher than 0.4 MPa (4 kgf/cm2), if vessels, process vessels and pipelines
are equipped with gray cast iron accessories.
5.14. Hydraulic or pneumatic strength testing pressure must be kept within 5 minutes, and then
reduced to operating one.
During testing of glass pipelines the testing pressure should be kept within 20 minutes.
5.15. Leakage testing time, if not established in working documentation, must be determined by
duration of examination of vessels, process vessels, pipelines, at that testing shall be recognized as
successful if no leaks have been detected in split and permanent connections, and no pressure fall
according to pressure-gage indication has taken place during changing the testing temperature.
5.16. The final phase of individual testing of equipment and pipelines must be signing the individual
testing equipment acceptance act for comprehensive running-up.

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 15/23
ATTACHMENT 1 obligatory

SEQUENCE OF START-UP WORKS

1. Start-up work shall include the set of works to be performed during the period of preparation and
conducting individual tests and equipment comprehensive running-up1.
2. The period of individual testing ( hereinafter referred to as "individual testing") shall mean the phase
including installation and start-up works that provide observing the requirements established by the
working documentation, standards and technical specifications required for carrying out testing of a
particular items of equipment, machinery and apparatus in order to prepare equipment for acceptance
by working commission for comprehensive running-up.

Note: Start-up works are subject to be paid by customer at the account of aggregate budget for putting into operation
entities, buildings and facilities approved in the established procedure.

3. The period of comprehensive running-up of equipment (hereinafter referred to as "comprehensive

running-up") shall mean the phase including start-up works to be performed after the equipment
acceptance by the working commission for comprehensive running-up, and also conducting
comprehensive running-up as long as facility accepting for operation by the State acceptance
commission.
4. Works to be carried out during the phase of facility design capacity development after acceptance
of the State acceptance commission shall not be included in the scope of start-up works and must be
performed by customer in sequence established by the corresponding Ministries and Agencies of the
USSR.
The duration of the facility design capacity development phase is determined by the "Duration
Standards of Facility Design Capacity Development of Industrial Enterprises, Plants Putting into
Operation" approved by Gosplan (State Planning Committee) of the USSR.
5. Prior to the beginning of the individual testing the start-up works for electrical equipment,
automation control systems, hygiene and thermopower equipment shall be executed. The fulfillment of
the above works shall provide conducting of individual testing of processing equipment.
The individual testing of the above devices, systems and equipment shall be carried out in accordance
with the requirements established by SNIPs for conduction the related type of installation operations.
5. During the phase of comprehensive running-up the following works and operations shall be carried
out:

checking, adjustment and ensuring the joint interconnected idle operation of equipment in the
projected process line with subsequent transition of equipment to operation under load and achieving
the stable design process conditions that provides production of the first product set in amount
established for the initial development of the facility design capacity according to the "Duration
Standards of Facility Design Capacity Development of Industrial Enterprises, Plants Putting into
Operation" approved by Gosplan (State Planning Committee) of the USSR.

Before the beginning of comprehensive running-up of equipment the automated and other emergency
alarm and fire protection systems must be commissioned.
7. The scope and conditions of the comprehensive running-up conductance, including duration of the
phase of equipment comprehensive running-up, number of required working personnel, fuel and
energy resources , materials and raw materials, shall be established by the industry branch regulation
of acceptance for operation of construction completed enterprises, facilities, shops and works
approved by the related Ministries and Agencies of the USSR and agreed by Gosstroi of the USSR.
8. For the period of comprehensive running-up of equipment under operating conditions the general
contractor and subcontractor shall provide duty work of their engineering and technical personnel in
order to ensure on-line service of corresponding workers for eliminating construction and assembling
defects.
9. The scope of start-up works and their schedule must correspond to the equipment technical
specifications of vendors, safety rules, fire protection regulation, regulations of the State supervision
authorities.

10. Works to be fulfilled in the process of starting-up and comprehensive running-up not planned by
the project documentation shall be carried out by customer or by construction and installing
organization on behalf of the customer using documentation drawn up in the established procedure.

1In this provision the notion "equipment" covers the entire process system of facility, i.e. the set of process and all
other types equipment and pipelines, electrical, sanitary and technical and other devices, automation units providing
production of the projected first product set.

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 16/23
11. Equipment defects identified in the process of individual testing and comprehensive running-up of
equipment, and during start-up works must be eliminated by customer (or vendor) before facility
acceptance for operation.
12. Works and operations carried out during the phase of preparation and conducting comprehensive
running-up of equipment described in item 6 shall be performed according to schedule and program to
be developed by customer or, on his behalf, by start-up organization. These schedule and program
must be approved by general contractor and subcontracting organizations and, if necessary, by top
officials of the equipment vendors.
13. Comprehensive running-up of equipment shall be conducted by the operation personnel of the
customer with involving engineering and technical personnel of general contractor, engineering and
subcontracting installation organizations, and, if necessary, equipment vendor personnel.

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 17/23
ATTACHMENT 2 obligatory

OPERATING DOCUMENTATION TO BE DRAWN UP DURING INSTALLATION OF EQUIPMENT

AND PIPELINES

At installation of equipment and pipelines the operation documentation must be drawn up and
submitted to the working commission (except items 1, 2, 3) upon accepting equipment and pipelines.

Item Name of Document Content of Document Note

1 Acceptance Act of Working Set of documentation to be in

Documentation for compliance with CH 202-81 and
Conducting Operations standards of the system of project
documentation for construction;
adaptability to conducting installation
works including testing, to performing
Section Facility and Unit methods of
works; documentation acceptance date;
customer, general contractor and
installing organization representatives'
signatures.
2 Acceptance Act of according to the form of the CSU
Equipment, Items and (Central Statistics Agency) of the USSR
Materials for Installation
3 Readiness Act of Buildings, according to the form of intermediate
Facilities, Basements for acceptance of critical structures SNIP
Installation Works 3.01.01-84
4. Testing Act of Vessels and Content to be established by VSN (All- To be drawn up for each
Process Vessels Union Building Norms) vessel and process
vessel subjected to
testing
5.4 Testing Act of Pipelines Content to be established by VSN(A11- To be drawn up for each
Union Building Norms) pipeline line
6. Testing Act of Machines Description and number of position To be drawn up for each
and Machinery under working drawings; testing machine or device
duration in accordance with vendor's subjected to testing
guidelines.
Testing conclusion. Signatures of
customer and installing organization
representatives.
7. Examination Act of To Be according to the form of examination
Buried Items Installation act of buried items installation SNIP
(during installing equipment 3.01.01-84
and pipelines)
Item Name of Document Content of Document Note
8. Examination Act of Description and number of position Logbook indicating
Equipment Basement according to working drawings; results measurements made
Positioning of checking conformity to the vendor's during installation to be
guidelines, conclusion on checking and attached to the act
grout permit. Signatures of customer
and installing organization
representatives.
9. Acceptance Act of according to SNIP III-3-81
Equipment after Individual
Testing
10. Welder's Diary Content to be established by VSN (All- To be drawn up only for
Union Building Norms) pipelines of I and II
category and for Pn
over 10 MPa (100
kgf/cm2)

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 18/23
 Item Name of Document Content of Document Note

11. List of Welders and Heat- Name of facility and installation

Treater department. Full names of welders and
heat-treaters. Stamp, rate, number and
validity term of certificate, signatures of
welding works supervisor and section
foreman
12. Welded Joint Quality Content to be established by VSN (All- To be drawn up only for
Control Register Union Building Norms) pipelines of I and II
category and for Pn
over 10 MPa (100
kgf/cm2)
13. Thermal Treatment Content to be established by VSN (All-
Register Union Building Norms) or industry
branch standards

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 19/23
ATTACHMENT 3 obligatory

MECHANICAL TEST OF STEEL PIPELINE WELDED PATTERNS

Mechanical test of welded patterns manufactured from test joints must confirm observance to the
following requirements:
а) point of maximum load under static elongation must be not lower the low point of maximum load of
welded pipe metal;
б) bending angles under bending test must be not lower the values given in Table.

Bending Angle not less, degree

Steel Grade Arc Welding at Wall Thickness Gas Welding
less than 20 mm more than 20 mm
Carbon steels with carbon 100 100 70
content less than 0.23%
Low-Alloyed steels 80 60 50
Low-alloyed heat resistant 50 40 30
steels
Martensitic-ferritic class steels 50 50 -
Austenitic class steels 100 100 -

в) no crack must be in the pattern flattened to gap equal to three thickness values of pipe wall; r)
tensile strength of welded joint metal under arc welding of pipeline with Pn 10-100 MPa (1001000
kgf/cm2) and I category pipeline with wall thickness 12 mm and more, determined using patterns of У1
type under GOST 6996-66 with notch located on welded joint metal, at temperature +20°C must be for
all steels, except austenitic ones, not less than 50 J/cm2 (5 kgs m/cm2), and for austenitic ones - 70
J/cm2 (7 kgs m/cm2).

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SNIP 3.05.05-84 20/23
ATTACHMENT 4 obligatory

DETERMINING THE TOTAL QUALITY SCORE POINT OF WELDED CONNECTION OF STEEL

PIPELINE USING THE RADIOGRAPHIC TEST RESULTS

1. The total quality score point of the welded connection shall be determined by addition the highest
marks of welded connection different item quality evaluation in accordance with Table 1.
2. Scaled evaluation of welded connection quality in dependence upon size and length of incomplete
fusion in welded joint axis, root penetration exceeding and incurvity, and also the availability of faulty
fusions and cracks is given in Table 1.

Table 1

Incomplete fusion in welded joint axis, root penetration exceeding and incurvity, availability of
Scaled faulty fusions and cracks
Evaluation
height (depth) in % of wall nominal thickness total length in pipe perimeter
0 poor penetration missed;
incurvity of welded joint root up to 10%, but not more up to 1/8 perimeter
than 1.5 mm;
exceeding root penetration up to 10%, but not more
than 3 mm up to 1/8 perimeter
1 poor penetration in welded joint axis up to 10%, up to 1/4 perimeter
but not more than 2 mm or up to 5% but not more than up to 1/2 perimeter
1 mm;
2 poor penetration in welded joint axis up to 20%, up to 1/4 perimeter
but not more than 3 mm or
up to 10% but not more than 2 mm or up to 1/2 perimeter
up to 5% but not more than 1 mm; not restricted
6 Cracks; independent upon length
Incomplete fusion between main metal and welded joint independent upon length
and separate bead joints;
Poor penetration in welded joint axis up to 20%, but not independent upon length
more than 3 mm

Note: Root incurvity value and penetration exceeding value for pipelines of the I-IV categories are not regulated.

3. The allowable sizes of impurities (cavities) identified under radiographic test and their scaled
evaluation are given in Table 2. The welded connection part shall be valued with 1 if there are no
impurities (pores) in it.

Table 2

Impurities (cavities) Clusters Total length at

Scaled any 100 mm
Wall Thickness, mm Width
Evaluation length, mm length, mm welded joint
(diameter) mm section
up to 3 0.5 1.0 2.0 3.0
more than 3 up to 5 0.6 1.2 2.5 4.0
more than 5 up to 8 0.8 1.5 3.0 5.0
more than 8 up to 11 1.0 2.0 4.0 6.0
1 more thanl 1 up to 14 1.2 2.5 5.0 8.0
more than 14 up to 20 1.5 3.0 6.0 10.0
more than 20 up to 26 2.0 4.0 8.0 12.0
more than 26 up to 34 2.5 5.0 10.0 15.0
more than 34 3.0 6.0 10.0 20.0

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 21/23
 Impurities (cavities) Clusters Total length at
Scaled any 100 mm
Wall Thickness, mm Width
Evaluation length, mm length, mm welded joint
(diameter) mm section
up to 3 0.6 2.0 3.0 6.0
more than 3 up to 5 0.8 2.5 4.0 8.0
more than 5 up to 8 1.0 3.0 5.0 10.0
more than 8 up to 11 1.2 3.5 6.0 12.0
more thanl 1 up to 14 1.5 5.0 8.0 15.0
2
more than 14 up to 20 2.0 6.0 10.0 20.0
more than 20 up to 26 2.5 8.0 12.0 25.0
more than 26 up to 34 2.5 8.0 12.0 30.0
more than 34 up to 45 3.0 10.0 15.0 30.0
more than 45 3.5 12.0 15.0 40.0
up to 3 0.8 3.0 5.0 8.0
more than 3 up to 5 1.0 4.0 6.0 10.0
more than 5 up to 8 1.2 5.0 7.0 12.0
more than 8 up to 11 1.5 6.0 9.0 15.0
more thanl 1 up to 14 2.0 8.0 12.0 20.0
3
more than 14 up to 20 2.5 10.0 15.0 25.0
more than 20 up to 26 3.0 12.0 20.0 30.0
more than 26 up to 34 3.5 12.0 20.0 35.0
more than 34 up to 45 4.0 15.0 25.0 40.0
more than 45 4.5 15.0 30.0 45.0
independent upon Impurities (cavities), clusters with size or total length
6
thickness exceeding the established values for mark 3 of this table

Note:
1. Impurities (cavities) with length 0.2 mm and less, if they do not form clusters and defect net, shall not be taking into
account during radiographic picture decoding.
2. Quantity of separate impurities (cavities) with length less than that given in the table must not exceed 10 for mark 1,
12 for mark 2, 15 for mark 3 at any 100 mm section provided that their total length does not exceed the values given in
the table.
3. For welded connections with length less than 100 mm, the given in the table values for total length of impurities
(cavities), and quantity of impurities (cavities) must be proportionally diminished.
4. Mark of sections of welded connections of pipelines Pn 10-100 MPa (100-1000 kgf/cnf) in which accumulation of
impurities (cavities) have been identified must be increased by 1 point.
5. Mark of sections of welded connections of all categories in which chains of impurities (cavities) have been
identified must be increased by 1 point.

4. GOST 19232-73 should be used for determining defect types and GOST 23055-78 for determining
defect size during radiographic picture decoding.
5. In conclusion report or in register of radiographic test the following issues must be reflected: mark of
welded connection determined using table 1; the highest mark of the welded connection section
determined by table 2; and total scaled evaluation of welded connection quality, for instance 1 / 2 - 3,
or 6/6 -12.

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 22/23
CONTENT

1. General Provisions 3
2. Installation Works Preparation 5
General Requirements 5
Acceptance of Equipment, Items and Materials for Installation 5
Installation Acceptance of Buildings, Facilities and Basements 6
Manufacturing of Pipeline Assembling Units 6
Process and Communication Units Assembling 7

3. Installation Operations 8
General Requirements 8
Equipment Installation 8
Pipeline Laying 8

4. Welded Connections and Other Permanent Connections of Pipelines 10

General Requirements 10
Steel Pipeline Connections Quality Control 10
Non-Ferrous Metal Pipeline Connections Quality Control 12
Plastic Pipeline Connections Quality Control 13

5. Individual Testing of Installed Equipment and Pipelines 14

Attachment 1. Sequence of Start-up Works (obligatory) 16

Attachment 2. Operating Documentation To Be Drawn Up

During Installation of Equipment and Pipelines (obligatory) 18

Attachment 3. Mechanical Test of Steel Pipeline Welded Pattern (obligatory) 20

Attachment 4. Determination of Total Quality Score Point of Welded Connections

of Steel Pipeline Using the Radiographic Test Results (obligatory) 21

________________________________________________________________________________________________________________________________________
SNIP 3.05.05-84 23/23